Telephone-exchange system.



H. G. WEBSTERl TELEPHONE EXCHANGE SYSTEM.

l. ,I APPLICATION FILED MAY I6. 1914- 1,252,974. Patented Jan. 8,1913.

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TELEPHONE EXCHANGE SYSTEM.

APPLICATION min Mule. 1bn.

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H. G. WEBSER. TELEPHONE EXCHANGE SYSTEM.

PPLrcATIoN FILED MAv16.1s14'. V 1 ,252,974. Patented Jau. 8, 1918.

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TELEPHONE EXCHANGE SYSTEM.

APPLICATION msu MAY16.19|4.

Patented Jan. 8,1918.

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W ITNESSES INVENTOR H. G. WEBSTER.

TELEPHONE EXCHANGE SYSTEM.

` APPLICATION FILED MAY I6. I9I4. 1,252,974. H Patented Jan. 8,1918.

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15,252,974. Patented Jan. 8,1918.

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El El v [NVE NTOR H. a. WEBSTER.

'TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED nu 16.l 1914.

Patented Jan. 8, 1918.

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TELEPHONE EXCHANGE SYSTEM. rrucmon f|' Lzu nu 1s. 1914.

Patented Jan. 8,1918.

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' Patented Jan. 8,1918.`

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Patented Jan.8,1918.

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APPLICATION man MAY I6. |914.y

Patented Jan. 8,1918.

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INVENTOR H. G. WEBSTER. -TELEPJHUNE ExclHANGE SYSTEM.

APPLICATION FILED MAY I6. 19H. K

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APPLICATION FILED MAY 16. |914.

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Patented Jam, 8, 1918 H. G. WEBSTER.

TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED MAY I6 1914.

INVENTUR SUN WITNESSES H. G.`WEBSTER.

TELEPHDNE EXCHANGE SYSTEM. APPLICATION msu MAY 1s. 1914.

Patented Jan. 8,1918.

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WITNESS ES INVENTOR q @Mama-3,91 amarga imams, Asmara. ,arrasarASSIQNMFBUS .T'O'

Araucaria; ma may 1 6, 1914. gum No. 838,961.

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Be i'ltkynownthat 1Ha13nr G- vWEBSTIfifi, L 'zenfflh@ UnitedStates,residing at cago," ihn-the, county (ifI Cook, angl .State of 6 llmns",.have invented 'a new and n seful Ingp'royexncnt inV,Terlephcne-Egnz-hange Systems, 1Of i which" the following is a'specificayv mferrition' relates to VMtelephone ex- 10 chgingeq L "cllpa rticu'larly `to that f direct yloatrnlln ,ifi machamsmsforhuildm-,11,13 a

' dingto thelirgcof tels Y paucity ofvthesystem'.

@My invention also comprises certain vimtiren-pe. *n

Edvard e .a eac case' the secondary 'selection isac'orn .pli'shcdybyu-'a1sr'rifnlilar relay `grmp associated Y with sel'lt `tion. serresto5 select an" 'inferrcda-tel which llas :been yconnected with n Ii,

an increase inthe `total line capacitypf sys- 'tems en) loyying a;'serres 'of automatic swiktche'sf or completing conn'ection-bet'n'eenPatented Jan- 8, 1.918-

a callingand'calledslibscriber. In'p'rior ydigit system, it'l'xas'becpossibleV to use only those call `numberscomprising fivehdgits each andbeginning VJwith the numenlsfone to nine, inclusive. Callrnurnbersc(insisting of one', two,.three and f'ourdi its have not luisthereforejbeen lto ,this fextrenflimi'tetl: 1t 1s one lyfeatilreof thepresentimention to provrlderneans forwutili'zinjg those'eall numbershaving fewer digits .than the inlaximm n uhmber` of'digits'ernployedinthe' 'system thus materially increasing theftotal' linecaproyenient withrespect to circuit arra'nfe- In accordance with the .particularembodiments ofl'vrnyinvention here illustrated, theA line` of a'eaullingsubscriber is extended ,to-

` the Alteylsfet operator (who manipulates the.

ns. In one :embodiment thefprimaryf; Ifl lis. `performed bythe4answering or vgator of a manualexehange sing` lays'arrangedgenerally inthe manner e-Ik been heretofore utilized lin 1 "e-digt Sys`4 tem, an'd'the line capacity offsnchsystems vrnent.{1I}@other ldtalls which,togelhgerjylth i the above; [will "'be'vrknore fpllylexplained inthefollowin g "description taken pm connec-4 ftion'Withfthejccornpanying drawings. $0`

y Vary answering cord` *nir-2 :In :1nf Y Vvo'itler' vcm1;poliment -alsohere escrlbedl the. primary selection 1s accomphsledfby; :y rem.v

E. Clement 'March '24, l1914-; jfl

aint mediate' trunk. Thefsecpdaryy "ics to select andronnect to an dietev"trunk Ia first' selector which has li'fmlben. s'sociatedwith thecalled 'subscrbel-jys" a f I tion; tertiarylselection is performed by asi'miilarfrelay roup.ivhclr'isdrectl rt-of tlfe primary selectingoperascribed.' The first selector serves to pick a trunk leading to adistant exchange and terminating 1n a second selector, to be hereyafterreferred to as an inter-office selector.

The inter-office selector serves to pick a local trunk termina-ting in athird selector, to be a l'ed; -group of keyset apparatus with which the'cia ted.

hereinafter referred to as a local selector." The local selector servesto pick a l'trunk leading to a connector associated with the line groupcontaining the called subscribers -.line; and the connector serves topick the desired line and to automatically apply current to ring thebell at the sub-station,in case the desired line be idle. The firstselector may also pick a local selector, seving as a second selector,located within the originating exchange.

Referring now to the drawings, Figure 1 illustrates an A operatorsapparatus, and line circuit arrangement which may be used in case theprimary selection is performed by an A operator. Fig. 2 lillustrates thethe first selector to which the calling line is 'connected by the Aoperator. Fig. 3

illustratesl the inter-oiice selector, Fig. 4'

the'local selector, and Fig. 5 the connector. Fig. 6 shows thearrangement of the tens and units relays for performing the secai ondaryselection, and Fig. 7 thesecondar control apparatus for controlling andvguardS ing the secondary selecting operation. Fig.

- 8 illustrates a section of the intermediate trunk with which thegrouped relays of Fig. 6 are associated, and also the apparatus ior-fpntrolling and guarding the tertiary select' ,inv operation. Fig.l 9illustrates the grouped re ays associated with eaclr keysetfo'raccomplishing the tertiary selection, 4together with .switchingapparatus for guarding a ainst delay 1n case a keyset becomes dis and..Fig. 10 shows the complete group of-ter-tiary selecting relays is asso-lFigs. 1'1, 12 and 13, in connection with Figs.A 3 to 1Q, inclusive,illustrate that-modication of -my invention in which the primarysel'ection is performed-by relay groups rather than manually by anAoperator. Fig. 11 shows a subscribers line circuit 'and the relay groupfor selecting a calling line. Fig. 12 shows the apparatus forcontrolling and guarding v'the prima'ry'selectingapparatus of Fig. 11,and Fig. 13 shows the first selector associated withkthe relay group ofFig. 11, andwhich is thereby connected with the calling line. Figs. 14andl illustrate a modification of the tertiary selection and keysetapparatus, whereby calls originating and terminating within the samesubexchange may be established using talking trunks entirely'local tosuch exchange. Fig. 16 is a diagram illustrating a method of arranging aplurality of keysets in related sub-groups for the use of a plurality ofkey set operators. Fig. 17 is a diagram illustrative of my invention vasembodied in an ex change system comprising five main exs changes and twosub-exchanges, wherein the keyset operators are all located at thecentral main exchange. Fig. 18 is a chart showing the proper manner ofrelating the drawings 1 to 1 0, inclusive, to illustrate the arrangementin which the primary selection is performed by A operators; and Fig. 19is a similar chart showing the arrangement of the drawings forillustrating the modification in which the primary selection isautomatically performed byrelay groups.

Referring first to the traveling switches indicated in the accompanyingdrawings, vthe selectors and connectors are of that type in which theswitch Wipers 'are first` directivcly driven in a rotary direction untilopposite the elected grou of contacts; and are then driven in a verticaldirection with the wipers in engagement with the bank contacts. In theselectors, the vertical stepping isautomaticallycontrolled. to brin'o'the wipers to restx lwhen an idle set of bank contacts is reached whilein the connectors, the vertical travel is directively controlled toselect an elected set of bank contacts. In the selector switches thereare eleven sets of bankcontacts in each vertical row, while in theconnetors there are but ten sets, these constituting the terminals ofcalled lines. The mechanical structure of a suitable switch forpractising my invention is described in Patent No. 977,536, issued to C.

H. North'December 6, 1910, although my i`nvention is not limited to'this particular switch mechanism.

The' firstv selector switchv is indicated in Fig. 2 by the-Wipers Z152,D53, bfl, with their associated bank contacts','alnd the'r'o- 'tarydriving magnet 11:20, the vertical magnet b21', and the release magnetL22. A rotary oiljnormal contact set is indicated at- 525; and 1sactuated at the first rotary step of the'switch and restored tonormalatthe end of the rotary restoring motion 'of the j switch.Vertical off-normal contact isets, are" and restored at the end of thevertical re storing motion thereof. The inter-oilice selector isindicated in Fig. 3 of the drawings by the rotary driving magnet 1120,the vertical magnet 2221, the release magnet :11.22, the

"indicated at 550 and b51, these being actu ated at the first verticalstep of` the Switch

